VISOCOLOR® alpha Hardness (residual)
Colorimetric determination of residual hardness
	Colorimetry with a mixed indicator

Data and ordering information
Cat. No.	935 080
Type	colorimetric test kit
Range	0.00 · 0.04 · 0.08 · 0.15 · 0.30 °d
Sufficient for	200 determinations
Shelf life	at least 12 months
Sea water suitability	no
Detectable with PF-11	no

The total hardness of water is based on its content of alkaline earth ions (calcium and magnesium ions). This content depends on the geological conditions the water encounters during its course and may vary widely. Knowledge of the total hardness is important for the use of water in industrial as well as municipal applications, e. g. in the household as wash water or as boiler feed water in industry.